import java.util.regex.Matcher;

import java.util.regex.Pattern;

class SqueakyClean {

static String clean(String identifier) {

String task1 = identifier.replaceAll("\\s", "_");

Matcher matcher = Pattern.compile("-(\\w)").matcher(task1);

StringBuffer sBuffer = new StringBuffer();

while (matcher.find()){

matcher.appendReplacement(sBuffer, matcher.group(1).toUpperCase());

}

matcher.appendTail(sBuffer);

String task2 = sBuffer.toString();

String task3 = task2.replace("3","e")

.replace("0", "o")

.replace("4", "a")

.replace("7", "t")

.replace("1", "l")

.replace("3", "e");

String task4 = task3.replaceAll("[^a-zA-Z_]", "");

return task4;

}

}